Figure 3

Left panels: maximum pressure jump amplitude (computed as the difference between two consecutive extrema located within a 2 h window centered around the arrival of the atmospheric perturbation) observed at different stations (color dots) and for the different wave passages. The black lines show the trajectory of the wave fronts from Tonga to its antipodes. Central panels: spectral location of the maximum energy increase observed for each station (color dots) and for the different wave passages; it has been determined as the period with the highest ratio between the spectral energy during each passage and the mean (red noise) spectrum of the station. Right panels: regional averages of the ratio between the energy spectra at each wave passage and the background red-noise spectrum computed at each station, as computed for the right panel of Fig. 2. Each panel shows the mean (solid line) and the 75% percentile and the 25% percentile (upper and lower limits of the shadow) for each of the averaged regions (Pacific Ocean, including stations in Australia. Hawaii and Alaska, in blue; continental USA, except Alaska, in red; Europe, in green). The 95% significance level is indicated with dashed lines. The maps have been drawn with MATLAB³³ using the M_Map³⁴ toolbox (https://www.eoas.ubc.ca/~rich/map.html).